The terms "hack" and "hacking" are also used to refer to a modification of a program or device to give the user access to features that were otherwise unavailable, such as by circuit bending. It is from this usage that the term "hacking" is often used to refer to more nefarious criminal uses such as identity theft, credit card fraud or other actions categorized as computer crime. Hacks are usually achieved by a flaw found in the software. These flaws allow code to be built around using reverse engineering. Hacks that allow complete device modification allow Homebrew applications and Games to be played easily. Piracy is a problem that occurs when hacks are achieved. Using Hacks voids warranty and should only be done if you are completely sure its something you want. Be careful of what you do. Hacks that are downloaded from the internet may contain malware. Be sure to hack a Anti-Virus active before you download anything off the internet.
A hack could be anything from a simple icon modification to a full device overhaul.
Basically anything that was not intended for the device to do.
IPod Touch 1G
IPod Touch 2G
IPod Touch 3G
IPod Touch 4G
IPhone
IPhone 3G
IPhone 3Gs
IPhone 4
IPad
IPad
Apple TV
Playstation Portable 1000
Playstation Portable 2000
Playstation Portable 2000 V3
Playstation Portable 3000
Playstation Portable GO
Playstation 2
Playstation 2
Playstation 3
Dingoo A320
Dingoo A330
Nintendo DS
Nintendo DS Lite
Nintendo DSi
Nintendo DSXL

Android Phones
Samsung Galaxy S Tab
Nintendo DSi
Nintendo DSXL
Android Phones
Samsung Galaxy S Tab